Heat treatment method for parts

Abstract

A heat treatment method for parts comprises the steps that a furnace body is separated from a furnace cover, and the parts are put into a furnace cavity; the furnace cover hermetically covers the furnace body, the furnace cavity is heated to a set temperature, and the parts are heated in the furnace cavity at the set temperature for a set treatment time; and when the parts are cooled to the room temperature, the furnace cover is opened, and the parts are taken out. In the second step, after the furnace cover hermetically covers the furnace body, the furnace cavity is firstly vacuumized, the vacuumized furnace cavity is filled with protective nitrogen, then the furnace cavity is heated, and while the furnace cavity is heated, a fan positioned in the furnace cavity sucks air in a guide sleeve positioned below the fan into the upper portion of the furnace cavity, so that air at the middle lower portion of the furnace cavity flows into an inner cavity of the guide sleeve to form air circulation flowing up and down. The method has the advantages that the up-down convection circulation of the whole furnace cavity is formed in the furnace cavity, so that the uniformity of the temperaturein the furnace cavity is effectively improved, and the temperature difference between the upper portion and the lower portion of the furnace cavity during heating is within + / -2 DEG C.

Description

technical field [0001] The invention relates to the technical field of parts heat treatment, in particular to a part heat treatment method. Background technique [0002] An existing Chinese utility model patent with the application number CN201220464545.4 titled "Pit Furnace" discloses a well-type furnace, which includes a furnace body and a furnace cover on the top of the furnace body, and the furnace cover is provided with a fan , the lifting device used for opening and closing the furnace cover on the furnace body; since the utility model is provided with a fan on the furnace cover, when heating, under the action of the fan, the fan can move the hot air on the upper part of the furnace body to The lower part of the furnace body is blown, so that the hot air flows up and down in the furnace body, so that the overall temperature of the furnace body is more uniform, the value measured by the thermocouple is more accurate, and the blanks at each position are at the same tempe...

AI Technical Summary

Problems solved by technology

However, when this pit furnace is used for tempering or aging treatment of auto parts, under the high-speed rotation of the fan, only the gas in the furnace in the upper zone is rotating, and the gas in the furnace in the middle and lower zones is not rotating, forming a dead angle , so it is difficult to control the temperature uniformity in the furnace within ±20°C, and when the pit furnace is used for tempering or aging treatment of auto parts, the furnace temperature uniformity must be within ±5°C, so it is difficult to return Fire or aging treatment of auto parts, so the treatment method of this auto parts needs to be further improved

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